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58mm tamper (most other machines)

The standard size for Gaggia, De'Longhi and commercial baskets.

This link opens an Amazon AU search. Check the listing has an Australian plug and warranty before buying.

Also in accessories

Timemore · Accessories

Timer scale for weighing doses and shots.

Generic · Accessories

The right size jug is why café milk looks better than yours.

Generic · Accessories

Breville baskets are 54mm. The plastic tamper in the box is not.